Malicious PDF — malware analysis report

Static analysis result for SHA-256 2319384f81321cad…

MALICIOUS

PDF

95.5 KB Created: 2021-07-24 00:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e44336d3425802627df3fea57e64a631 SHA-1: 4a078d15dc1c4445c797aa59dbaf296f6c5c3185 SHA-256: 2319384f81321cad49a7d81a2763a6b094b6bf94e044917be3959b3f9c39b8c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837dc879b89---niroja.pdf In PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080faa188584---64270280611.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/29830700606.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/de73421b28d83b7084c13760857e64e2/30211905937.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2f212da87---13860112200.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/bim4vshuppacgpchlqepsi9hgc/kurunopiku.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/39873941856.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/2d8s9h1j7v3d2qki9loa0kqm13/jedoputavularunojiro.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d26077ad4---rirapabuxefibed.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/88085841821.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2fe6eb09b86a608c90c93f8e688f27a7/5940547113.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/2r6tebg8pca4cj1j5i3u0rmok7/32997549233.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/43070590019.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/64217287338.pdfIn PDF document text
    • http://yulintimber.cn/d/files/zobezimojoruvovuxogugifo.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/63091a6ecff92ac3c5d78ae8fdf07c23/99388290136.pdfIn PDF document text
    • https://flomogroup.com/upload/files/debebawuwibugu.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8bhem2an0imsp84iru486f83sf/gexogaxum.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/e780a923e1ac9437c4bf987bc67e9543/zukulukamivowogazoba.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/fekedam.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/11954824356.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/fexamobaw.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/65766018943.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/6369217902.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a932d4054---52394396210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=stickman+fight+battle+shadow+warrior+mod+apk+android+1PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 11512 bytes
SHA-256: d4aad90dd89863b548acaefefab17aeae5b2128c9c960fced8731b6c841ae114
font_01_sfnt_off000128d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E6 17968 bytes
SHA-256: ee9d583de25d4b2bfb59ddbf5acef2762fbe56ba35b422143672ebf938bd3b10